By design, the average GPA should be close to 2.5. Most schools try to modulate the difficulty of their courses to maintain a C+ average year-to-year. In my engineering school, they had a schedule of expected class averages for each year in the program; professors that wanted to assign significantly higher or lower grades had to justify their decision to the department head. After all, if the class average is 3.5, there's no headroom for above-average students to distinguish themselves.
However, I agree that any individual who wants to put in the work can probably achieve a 3.0 or better any most schools. Most people just don't want to do that much work.
However, I agree that any individual who wants to put in the work can probably achieve a 3.0 or better any most schools. Most people just don't want to do that much work.